1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* Copyright(c) 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <rdma/uverbs_ioctl.h>
#include "mmap.h"
/**
* rvt_mmap_init - init link list and lock for mem map
* @rdi: rvt dev struct
*/
void rvt_mmap_init(struct rvt_dev_info *rdi)
{
INIT_LIST_HEAD(&rdi->pending_mmaps);
spin_lock_init(&rdi->pending_lock);
rdi->mmap_offset = PAGE_SIZE;
spin_lock_init(&rdi->mmap_offset_lock);
}
/**
* rvt_release_mmap_info - free mmap info structure
* @ref: a pointer to the kref within struct rvt_mmap_info
*/
void rvt_release_mmap_info(struct kref *ref)
{
struct rvt_mmap_info *ip =
container_of(ref, struct rvt_mmap_info, ref);
struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device);
spin_lock_irq(&rdi->pending_lock);
list_del(&ip->pending_mmaps);
spin_unlock_irq(&rdi->pending_lock);
vfree(ip->obj);
kfree(ip);
}
static void rvt_vma_open(struct vm_area_struct *vma)
{
struct rvt_mmap_info *ip = vma->vm_private_data;
kref_get(&ip->ref);
}
static void rvt_vma_close(struct vm_area_struct *vma)
{
struct rvt_mmap_info *ip = vma->vm_private_data;
kref_put(&ip->ref, rvt_release_mmap_info);
}
static const struct vm_operations_struct rvt_vm_ops = {
.open = rvt_vma_open,
.close = rvt_vma_close,
};
/**
* rvt_mmap - create a new mmap region
* @context: the IB user context of the process making the mmap() call
* @vma: the VMA to be initialized
*
* Return: zero if the mmap is OK. Otherwise, return an errno.
*/
int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
{
struct rvt_dev_info *rdi = ib_to_rvt(context->device);
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long size = vma->vm_end - vma->vm_start;
struct rvt_mmap_info *ip, *pp;
int ret = -EINVAL;
/*
* Search the device's list of objects waiting for a mmap call.
* Normally, this list is very short since a call to create a
* CQ, QP, or SRQ is soon followed by a call to mmap().
*/
spin_lock_irq(&rdi->pending_lock);
list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps,
pending_mmaps) {
/* Only the creator is allowed to mmap the object */
if (context != ip->context || (__u64)offset != ip->offset)
continue;
/* Don't allow a mmap larger than the object. */
if (size > ip->size)
break;
list_del_init(&ip->pending_mmaps);
spin_unlock_irq(&rdi->pending_lock);
ret = remap_vmalloc_range(vma, ip->obj, 0);
if (ret)
goto done;
vma->vm_ops = &rvt_vm_ops;
vma->vm_private_data = ip;
rvt_vma_open(vma);
goto done;
}
spin_unlock_irq(&rdi->pending_lock);
done:
return ret;
}
/**
* rvt_create_mmap_info - allocate information for hfi1_mmap
* @rdi: rvt dev struct
* @size: size in bytes to map
* @udata: user data (must be valid!)
* @obj: opaque pointer to a cq, wq etc
*
* Return: rvt_mmap struct on success, ERR_PTR on failure
*/
struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, u32 size,
struct ib_udata *udata, void *obj)
{
struct rvt_mmap_info *ip;
if (!udata)
return ERR_PTR(-EINVAL);
ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node);
if (!ip)
return ERR_PTR(-ENOMEM);
size = PAGE_ALIGN(size);
spin_lock_irq(&rdi->mmap_offset_lock);
if (rdi->mmap_offset == 0)
rdi->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA);
ip->offset = rdi->mmap_offset;
rdi->mmap_offset += ALIGN(size, SHMLBA);
spin_unlock_irq(&rdi->mmap_offset_lock);
INIT_LIST_HEAD(&ip->pending_mmaps);
ip->size = size;
ip->context =
container_of(udata, struct uverbs_attr_bundle, driver_udata)
->context;
ip->obj = obj;
kref_init(&ip->ref);
return ip;
}
/**
* rvt_update_mmap_info - update a mem map
* @rdi: rvt dev struct
* @ip: mmap info pointer
* @size: size to grow by
* @obj: opaque pointer to cq, wq, etc.
*/
void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
u32 size, void *obj)
{
size = PAGE_ALIGN(size);
spin_lock_irq(&rdi->mmap_offset_lock);
if (rdi->mmap_offset == 0)
rdi->mmap_offset = PAGE_SIZE;
ip->offset = rdi->mmap_offset;
rdi->mmap_offset += size;
spin_unlock_irq(&rdi->mmap_offset_lock);
ip->size = size;
ip->obj = obj;
}
|
